Hematite facet-mediated microbial dissimilatory iron reduction and production of reactive oxygen species during aerobic oxidation
文献类型：期刊论文
| 作者 | Han, Ruixia ; Lv, Jitao; Zhang, Suhuan; Zhang, Shuzhen
|
| 刊名 | WATER RESEARCH
 |
| 出版日期 | 2021-05-01 |
| 卷号 | 195页码:- |
| 关键词 | Reactive oxygen species Redox Surface structure Iron oxides Shewanella oneidensis MR-1 |
| ISSN号 | 0043-1354 |
| 英文摘要 | Microbial dissimilatory iron reduction and aerobic oxidation affect the biogeochemical cycles of many elements. Although the processes have been widely studied, the underlying mechanisms, and especially how the surface structures of iron oxides affect these redox processes, are poorly understood. Therefore, {001} facet-dominated hematite nanoplates (HNP) and {100} facet-dominated hematite nanorods (HNR) were used to explore the effects of surface structure on the microbial dissimilatory iron reduction and aerobic oxidation processes. During the reduction stage, the production of total Fe(II) normalized by specific surface area (SSA) was higher for HNP than HNR due to steric effects and the ligand-bound conformation of the connection between iron on different exposed facets and electron donors from microorganisms. However, during the aerobic oxidation stage, both the SSA- and Fe(II)-normalized reactive oxygen species (ROS), including hydrogen peroxide (H2O2) and hydroxyl radical (center dot OH), were higher for HNR than HNP. Theoretical calculation results showed that the {100} facets exhibited a lower activation energy barrier for oxygen reduction reaction than {001} facets, supporting the experimental observation that {100} face-tdominated HNR had a higher ROS production efficiency than {001} facet-dominated HNP. These results indicated that surface characteristics not only mediated the microbial reduction of Fe(III) but also affected the aerobic oxidation of microbially reduced Fe(II). Accessibility of electron donors to surface iron atom determined the reduction of Fe(III), and activation energy barrier for oxygen reduction by surface Fe(II) dominated the ROS production during the redox processes. This study advances our understanding of the mechanisms through which ROS are produced by iron (oxyhydr)oxides during microbial dissimilatory iron reduction and aerobic oxidation processes. (C) 2021 Elsevier Ltd. All rights reserved. |
| WOS研究方向 | Engineering, Environmental ; Environmental Sciences ; Water Resources |
| 源URL | [http://ir.rcees.ac.cn/handle/311016/45739]  |
| 专题 | 生态环境研究中心_环境化学与生态毒理学国家重点实验室 |
| 作者单位 | 1.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Han, Ruixia,Lv, Jitao,Zhang, Suhuan,et al. Hematite facet-mediated microbial dissimilatory iron reduction and production of reactive oxygen species during aerobic oxidation[J]. WATER RESEARCH,2021,195:-. |
| APA | Han, Ruixia,Lv, Jitao,Zhang, Suhuan,&Zhang, Shuzhen.(2021).Hematite facet-mediated microbial dissimilatory iron reduction and production of reactive oxygen species during aerobic oxidation.WATER RESEARCH,195,-. |
| MLA | Han, Ruixia,et al."Hematite facet-mediated microbial dissimilatory iron reduction and production of reactive oxygen species during aerobic oxidation".WATER RESEARCH 195(2021):-. |
入库方式： OAI收割
来源：生态环境研究中心
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